1. M. Cohen and W. Owen, Micro Alloying 75,p. 2, Union Carbide Corp. New York (1977).
2. P. Repas, ibid, p. 387.
3. G. Delvecchio, J. Hood and D. McCutcheon, MiCon 78,p. 145, ASTM, Philadelphia (1979).
4. A. P. Coldren, G. T. Eldis and G. Tither, ibid, p. 126.
5. J. M. Little, J. A. Chapman, W. B. Morrison and B. Mintz, Proc. 3rd Int. Conf on the Strength of Metals and Alloys,p. 80, Inst. of Metals, London, Iron and Steel Inst. Pub. No. 36,(1973).